One-Pot Facile Fabrication of Multiple Nickel Nanoparticles Confined in Microporous Silica Giving a Multiple-Cores@Shell Structure as a Highly Efficient Catalyst for Methane Dry Reforming

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• 作者：Dr. Honggen Peng ; Xianhua Zhang ; Li Zhang ; Cheng Rao ; Jie Lian ; Prof. Dr. Wenming Liu ; Jiawei Ying ; Guohua Zhang ; Prof. Dr. Zheng Wang ; Prof. Dr. Ning Zhang and Prof. Dr. Xiang Wang
• 刊名：ChemCatChem
• 出版年：2017
• 出版时间：January 9, 2017
• 年：2017
• 卷：9
• 期：1
• 页码：127-136
• 全文大小：2187K
• ISSN：1867-3899

文摘

Methane dry reforming (MDR) is a very important reaction, which can efficiently use two kinds of greenhouse gases (CO₂ and CH₄) to prepare synthesis gas or produce green hydrogen energy. What inhibits the industrialization of MDR is the sintering of active Ni nanoparticles and severe carbon deposition for Ni-based catalysts. To resolve these problems, a novel structured catalyst with multiple ultra-small Ni nanoparticles (4.3 nm) as the core and microporous silica as the shell was rationally fabricated by a facial one-pot reverse micelle method and applied for MDR. The multiple-cores@shell (M-Ni@SiO₂) catalyst displays superior carbon resistance and long-term durability with the methane and carbon dioxide conversion close to thermodynamic equilibrium and a H₂ to CO molar ratio near 1, whereas the commercial catalyst, Ni/Al₂O₃, and Ni directly supported on silica spheres (Ni/SiO₂) show low stability and notable carbon deposition. The ultra-small Ni particle size and confinement effect of the porous silica shell are believed to be the determining factors for the outstanding performance of the multiple-cores@shell catalyst. The novel multiple-cores@shell structure catalyst could be potentially used for industrial applications of MDR.